JP2004040923A5 - - Google Patents
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- JP2004040923A5 JP2004040923A5 JP2002195656A JP2002195656A JP2004040923A5 JP 2004040923 A5 JP2004040923 A5 JP 2004040923A5 JP 2002195656 A JP2002195656 A JP 2002195656A JP 2002195656 A JP2002195656 A JP 2002195656A JP 2004040923 A5 JP2004040923 A5 JP 2004040923A5
- Authority
- JP
- Japan
- Prior art keywords
- switching
- primary winding
- frequency transformer
- switching elements
- circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Description
【0011】
このスイッチング電源回路では、スイッチング回路11のスイッチング周波数を共振回路12の共振周波数と等しいか、あるいはやや高めに設定して、高周波トランスTの1次巻線に流れる電流の位相をずらすことによって、図7(c) ,(d) に示すように、スパイク電流の発生を回避できるとともに、高周波トランスTに印加される電圧波形を正弦波状(または余弦波状)にすることができる。そのため、高調波成分の発生を抑制して、他の回路に対するノイズの影響が抑制されたスイッチング電源回路を実現することができる。[0011]
In this switching power supply circuit, the switching frequency of the switching circuit 11 is set equal to or slightly higher than the resonant frequency of the resonant circuit 12 to shift the phase of the current flowing through the primary winding of the high frequency transformer T as shown in FIG. As shown in 7 (c) and 7 (d), the generation of spike current can be avoided and the voltage waveform applied to the high frequency transformer T can be made sinusoidal (or cosine wave). Therefore, it is possible to realize a switching power supply circuit in which the influence of noise on other circuits is suppressed by suppressing the generation of harmonic components .
【0014】
高周波トランスTでは、通常、その1次巻線と2次巻線との間、1次巻線とコア(図示せず)との間、あるいは1次巻線とケース(図示せず)との間にそれぞれ容量結合が存在している。そして、電圧の高調波成分は、その容量結合を通じて電流が流れることになる。[0014]
In the high frequency transformer T, generally, between the primary winding and the secondary winding, between the primary winding and the core (not shown), or between the primary winding and the case (not shown) There is capacitive coupling between them. And, the harmonic component of the voltage causes current to flow through its capacitive coupling.
【0039】
ここで、たとえば第1および第4スイッチング素子SW1,SW4のオン期間中には、コイルL1,L2や高周波トランスTの1次巻線の漏れインダクタンスに電流(磁気)エネルギーが蓄えられる。そして、蓄えられたエネルギーは、第1および第4スイッチング素子SW1,SW4がオフされることにより、ダイオードD2,D3を流れ、ダイオードD2,D3はオン状態となる。そのため、第2および第3スイッチング素子SW2,SW3(コンデンサC2,C3)の端子間電圧を低く(略ゼロに)することができる。そして、この状態で、第2および第3スイッチング素子SW2,SW3をオンすることにより、スパイク電流が発生することを防止できる。[0039]
Here, current (magnetic) energy is stored in the leakage inductances of the coils L1 and L2 and the primary winding of the high frequency transformer T, for example, during the on period of the first and fourth switching elements SW1 and SW4. Then, the stored energy, the first and fourth switching elements SW1, SW4 are turned off, it flows through the diodes D2, D3, diodes D2, D3 are turned on. Therefore, the voltage between the terminals of the second and third switching elements SW2 and SW3 (capacitors C2 and C3) can be lowered (substantially zero). Then, in this state, by turning on the second and third switching elements SW2 and SW3, it is possible to prevent the generation of the spike current.
【0042】
また、第1および第2共振回路2,3によってスイッチング回路1の出力が正弦波状(または余弦波状)に変換されるので、高周波トランスTに流れる電流の高調波成分を抑えることができる。そのため、第1ないし第4スイッチング素子SW1〜SW4のスイッチングノイズや損失を抑制することができる。[0042]
Further, since the output of the switching circuit 1 by the first and second resonant circuits 2 and 3 is converted into a sine wave (or cosine wave) can be suppressed harmonic component of the current flowing in the high-frequency transformer T. Therefore, switching noise and loss of the first to fourth switching elements SW1 to SW4 can be suppressed.
【0044】
なお、第1および第2共振回路2,3の各共振周波数を設定するための定数が同一のときには、コモンモード電圧を最も小さくすることができる。しかし、これらの定数に多少のばらつきがあっても、従来のように第1ないし第2共振回路2,3のいずれかが、高周波トランスTの1次巻線の片端のみに設けられた場合(たとえば図6に示す回路)と比較すると、コモンモード電圧に対する十分なキャンセル効果を得ることができる。[0044]
Note that when a constant for setting the resonance frequency of the first and second co Fukairo 2 are the same, it is possible to minimize the common mode voltage. However, even if there is some variation in these constants, if any of the first or second co Fukairo 2,3 as in the prior art, provided only on one end of the primary winding of the high-frequency transformer T Compared to (for example, the circuit shown in FIG. 6), a sufficient canceling effect on the common mode voltage can be obtained.
【図3】図1に示すスイッチング電源回路の変形例を示す図である。FIG. 3 is a view showing a modification of the switching power supply circuit shown in FIG . 1 ;
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2002195656A JP2004040923A (en) | 2002-07-04 | 2002-07-04 | Switching power circuit and switching regulator equipped therewith |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2002195656A JP2004040923A (en) | 2002-07-04 | 2002-07-04 | Switching power circuit and switching regulator equipped therewith |
Publications (2)
Publication Number | Publication Date |
---|---|
JP2004040923A JP2004040923A (en) | 2004-02-05 |
JP2004040923A5 true JP2004040923A5 (en) | 2005-03-10 |
Family
ID=31703964
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2002195656A Pending JP2004040923A (en) | 2002-07-04 | 2002-07-04 | Switching power circuit and switching regulator equipped therewith |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2004040923A (en) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5457204B2 (en) * | 2010-01-08 | 2014-04-02 | 田淵電機株式会社 | Full bridge composite resonance type DC-DC converter |
JP5444142B2 (en) * | 2010-07-06 | 2014-03-19 | 株式会社日立製作所 | Power converter and motor drive device using the same |
JP5881386B2 (en) | 2011-11-24 | 2016-03-09 | 株式会社東芝 | Power converter |
US10003267B1 (en) * | 2016-12-19 | 2018-06-19 | Analog Devices Global | Isolated DC-DC converter with an H-bridge circuit |
US11923760B2 (en) | 2019-03-25 | 2024-03-05 | Panasonic Intellectual Property Management Co., Ltd. | Switching power supply apparatus for reducing common mode noise due to line-to-ground capacitances |
US11777412B2 (en) | 2019-03-25 | 2023-10-03 | Panasonic Intellectual Property Management Co., Ltd. | Switching power supply apparatus for reducing common mode noise due to line-to-ground capacitances |
US20220278622A1 (en) * | 2019-08-02 | 2022-09-01 | Panasonic Intellectual Property Management Co., Ltd. | Power conversion apparatus including transformer and operable with reduced common mode noise |
JPWO2022168199A1 (en) * | 2021-02-03 | 2022-08-11 |
-
2002
- 2002-07-04 JP JP2002195656A patent/JP2004040923A/en active Pending
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